Why was it that in the WTC building the core didn't rise so much faster than thsi building or the shanghai tower?

I think they built the whole steel cross section of the tower together, then cast the concrete around the core steel. Sort of like how they are doing the megacolumns in this building, except with the core.

Can't wait for the cladding to rise a bit more to get a better feel of how the tower is going to look as a whole.

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